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20May
FX-Audio Tube 02 Pro Review (Headphone Amp)
this is a review and detailed measurements of the FX-Audio Tube 02 Pro headphone amplifier.
Conclusions
I see a price of $79 and read “tubes” and I immediately equate that to junk. Such was not the case here. The casework is very nice, as well as some of the measurements. The amp simply does what audiophiles are asking: deliver them distortion and tons of it. The common misconception is that this distortion is either inaudible or euphonic. Neither was the case in my listening tests. Before you say, “but your test was not blind,” I will remind you that neither are all the remarks about the sound being euphonic! 
If you want a very low cost way to get a tube-based headphone amp/pre-amp that has good effort behind it, here is your chance with FX-Audio Tube 02 Pro.
